Bug Description

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This bug is about Acer Aspire 7736, 7736z, 7736g, 7736zg, and only exact those models. If you have different hardware, please file a separate bug, e g using the "ubuntu-bug audio" command. Other computer models are unlikely to be helped by the fix below.
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Current workaround for Lucid and Maverick:
* https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules
* Reboot
* You might have to turn up the volume of "Speaker" in alsamixer
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Sound does not play back on my Acer aspire7736z. I Check all my sound setting, but still nothing.

Aha, so it is a regression. Then could I have an alsa-info ( http://wiki.ubuntu.com/Audio/AlsaInfo ) from the same machine, both when it is working under 10.04 and when it is non-working under 10.10? I'll then try to see if there are any differences that can hint the problem. Thanks in advance!

Thanks, gbhuvanesh, I'll try that on my 7736z when I reload 10.10 to get the Alsa-Info that was requested earlier. But seeing as how I didn't need to do anything like that in 10.04, I don't think I should have to do it in 10.10.

Devs, since I just got this laptop, I don't have anything important on it. I'm totally willing to do anything you need me to do to get this figured out. I'll run that Alsa-Info script when I get home tonight.

I have attached a zip file containing three output files from the alsa-info script.

1. output from 10.04 with the sound working
2. output from 10.10 with no sound
3. output from 10.10 with the lines added to the alsa-base.conf file that were suggested here, these lines didn't solve the problem for me, but I thought I would run the script with them just in case

For the person who asked earlier, your alsa-base file should be located at /etc/modprobe.d/alsa-base.conf. Run the following in a terminal to edit it:

I believe it has something to do with the way the card is detected. I've been trying to get this working for a while now. The only thing i've found is switching to the 2.6.32 kernel solves it in any distro. In arch I tried downgrading alsa to 1.0.22 and still no sound but it works fine with 2.6.32 and alsa 1.0.23. I think the problem is in the snd-hda-intel driver not alsa. From my understanding the driver is built in to the kernel now?

Other interesting things i've found is that alsamixer reports a different chip in 10.10 vs. 10.04.

So if "model=auto" solves it for 4930 but not for 7736z, they are different bugs and so I'd ask you to keep the 4930 stuff to its own bug and 7736z stay here. Thanks.
@Jimmy, thanks for the alsa-info, I'll analyze it shortly.

@Niels & @Stigger -
Did you have any specifications in your /etc/modprobe.d/alsa-base.conf? I installed the deb from @David, but still no sound on 7736z. Is there a step not explicitly given that I missed?

Cool! :-) Just to make sure we get the best fix for this bug, could you check all inputs and outputs to make sure they are all working? (E g internal mic, mic jack, internal speakers, headphones, digital I/O if any, etc)

langmarp, this bug seems to be pretty specific to the 7736z so I don't think it will solve your sound issues. You should probably make a post in the Ubuntu forums instead, people will be more helpful over there.

On Thu, Oct 14, 2010 at 01:23:30AM EST, Jimmy Buck wrote:
> langmarp, this bug seems to be pretty specific to the 7736z so I don't
> think it will solve your sound issues. You should probably make a post
> in the Ubuntu forums instead, people will be more helpful over there.

Actually, as David said, filing a new bug is a much better approach, as we automatically get information about your hardware, and can immediately start working with you to fix your problem. I don't know about the other audio developers, but I personally don't frequent the forums.

@dreamon, your "modinfo snd-hda-codec" shows that you have no alsa driver overrides installed.
After the deb has installed, and you have rebooted your system, "modinfo snd-hda-codec" should say something with "/updates/dkms/" in it.

I'm still having sound issue with Aspire 4930, tried solutions suggested by @gbhuvanesh and also the 'alsa' patch by David Henningsson, but cannot get it working. I added following lines at the end of file alsa-base.conf

> Today found sound!
> With you deb it works. But every time I start I have to tune up volume by alsamixer option -> Speaker.
> After reboot its again by 0%(no Sound).
>
> Could not find a way without alsamixer to bring sound to work, without
> tuning speaker option.
>
> What can I do?
>

I see that some audio stuff was just updated in Maverick, was this fix included? I noticed it on my other computer and I don't currently have Maverick installed on the laptop so I'm not able to check for myself at the moment.

It works fine in lucid just maverick is the problem
On Nov 8, 2010 9:50 AM, "David Henningsson" <email address hidden>
wrote:
> @Jimmy, the fix will be in Natty. There is quite a bit of code to fix
> it, so I'm a little scared of letting it into Lucid and Maverick.
>
> --
> [Acer aspire 7736] Playback not working due to incorrect SKU override
> https://bugs.launchpad.net/bugs/617647
> You received this bug notification because you are a direct subscriber
> of the bug.

@Niels, good point. I have sent this patch for SRU for Maverick now. Note that due to a new policy, it is vital that you check that the patch works, i e once you'll get a notification in this bug and the "verification-needed" tag added, you'll need to replace that with "verification-done" once you have tested that the proposed kernel works. If you fail to do so, the patch will be dropped from the kernel. You'll have less than one week once the "verification-needed" tag has been added.

I have no sound on my Acer 7736Z, I added those 2 lines in alsa-base.conf, installed the deb file, rebooted many times, but no sound.
I attached my alsa info file. I think the soundcard(s) is not detected.
Can anyone help?

I have sound with the deb but the level is low and barely audible even with gnome and alsa turned up full. I think I was content in Lucid and I am tempted to go back. The mic did not work well in Lucid either.

Ok, Bug fixed now... Nano saved a file in /etc/modprobe.d/ which shouldnt be there... contained the line "options snd-hda-intel model="acer-aspire""
thx to David Harringsson who helped me per IRC to find the error
Finally i got sound with ubuntu, yeah!

Accepted linux into maverick-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!